Manifold/header/muffler/tail Pipe problems of the 2004 GMC Sierra

Exhaust manifold bolts breaking off causing exhaust leak where manifold bolts onto head. Due to exhaust leak now vehicle is throwing codes for catalytic threshold low. Which leads to a magnitude of problems to lack of power, poor fuel mileage and not being able to pass emission test in some states. Problem results in upward of thousand dollars in repair for faulty bolts, after researching said problem it is a common problem with gm v8 of this year older and newer as well. This is a major defect and flaw in gm's design and needs to be addressed aspa!!! this is a prob that is affecting epa laws and needs action taken against gm to fix this problem before it gets worse. Gm needs to be held responsible for their vehicles and poor design and or products that go into them that causes laws or safety to be broken or effected!.

I smelled exhaust fumes in the cab of the pickup truck and heard a shrieking sound under the hood. I had to put the window down to relieve my disiness from the fumes. Upon investigation I found 3 of the 6 bolts broken that fasten the exhaust manifold to the engine. Exhaust fumes are leaking from the burned out gasket.

Multiple exhaust manifold bolts are broken on each side.